[issue34134] multiprocessing memory huge usage

[Xiang Zhang]

Xiang Zhang <angwerzx at 126.com> added the comment:

One thing worth a try here maybe turn `len` to `operator.length_hint`. But I am not sure it's a good idea and just a mention here.

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nosy: +xiang.zhang
versions:  -Python 2.7, Python 3.4, Python 3.5, Python 3.6, Python 3.7

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